Scientific ergonomic design encourages healthy neutral handshake wrist and arm positions for smoother movement and less overall strain. . 800 / 1200 / 1600 DPI Resolution Optical Tracking Technology provides more sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces. . Added next/previous buttons provide convenience when webpage browsing the superior choice for internet surfers, gamers and people who work at length at the computer. . Enters power saving mode (power is cut off completely) after 8 minutes idle, press right or left button for it to wake. Product dimensions: 120*62.8*74.8 mm product weight: 3.4 oz. . Package includes: 1 Anker Wireless Vertical Ergonomic Optical Mouse (2 AAA batteries not included), 1 2.4G USB receiver (in the bottom of the mouse), 1 instruction manual. 18-month hassle-free warranty. .